上海软土地层中TRD水泥土搅拌墙强度检测与分析

Test and analysis of strength of cement-soil wall constructed by TRD method in soft soil of Shanghai

基于上海软土地层多个深大基坑工程实践,对不同深度、厚度和应用形式TRD水泥土搅拌墙墙体芯样强度试验成果进行系统的统计分析研究。分析表明,对于上海典型地质条件,检测最大成墙深度60m,不同土层中墙体芯样表观无明显差异,墙深范围内墙体的完整性和均一性均较好,墙体芯样28d无侧限抗压强度值普遍大于1.0MPa,且浅层软黏土和深层砂土中水泥土强度无明显差异。

TRD cement-soil wall is used in a number of deep and large foundation pits of Shanghai,a study on the strength of the TRD walls with different depth and thickness is carried out based on the testing results of coring samples.The testing results show that,within the maximum depth of 60 m,there is no obvious difference among the TRD wall' s samples at different typical soil layers. The 28 day' s compressive strength of TRD walls are commonly larger than1. 0MPa. No major difference is found for the compressive strength between the shallow soft clays and deep sand layer,within the depth of the TRD wall,it shows a high integrity and homogeneity.